ở chuột tính trạng màu lông do gen nhiễm sắc thể thường quy định và lông xám trội nằm trên nhiễm sắc thể thường quy định và lông xám trội hoàn toàn . so với lông trắng ,hãy biện luận và lập sơ đồ lai của P nếu F1 xuất hiện 1 trong kết quả trên : a) F1 đồng loạt có lông xám b) F1 vừa có lông trắng vừa có lông xám c) F1 thu toàn chuột lông trắng

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